Enigmatic Horodyskia williamsi from Precambrian Australia

Putative Oldest of the Multicellular Fossils

Horodyskia williamsi

Geological Time: Mesoproterozoic (1.4 Billion years ago)

Size (25.4 mm = 1 inch): Each individual is some 2 mm across; Clusters are 30 mm, 25 mm and 17 mm across on a 60 mm by 160 mm matrix

Fossil Site: Backdoor Formation, Western Australia

Code: AS13027

Price: Sold

Description: Some 30 years ago the late Robert J Horodyski discovered what he termed “problematic bedding plane markings” in Precambrian deposits in Glacier National Park of Montana. These were later found to be the remains of what are currently the oldest known multicellular organisms named Horodyskia moniliformis in his honor. In addition to those found at Glacier National Park, this species found in Australia is also known to science. Horodyski called them a string of beads” a most apt description. They appear to have been attached by a stolon (the “string”) and had a regular position along the chain. Given the presumed nutrient-poor water in which they lived they are thought to have been photosynthetic like the stromatolites. Here is a chance to obtain what is currently believed to be the earliest of multicellular organisms to have colonized the planet. This is a collection of three colonies. It is presumed as each colony aged it became longer. The longest I have had was some 65 mm across.

Reference: Smithsonian Institution Press Contributions to Paleontology, no 94, 202.

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